The effects of the spatial correlation on the outage probability and goodput are investigated in Figs. REF  and REF , respectively. From both figures, the theoretical and simulation results are in perfect agreement under low spatial correlation due to the assumption made in (REF ). It can also be observed from Figs. REF  and REF  that the spatial correlation adversely impacts the outage probability and goodput. In particular, the spatial correlation would severely impair the performance of the virtual MIMO-NOMA system if \(\rho >0.5\) , which conforms to the conclusion drawn in [1]}.
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